A mechanized supporting tunnel initial support sequence construction method

By analyzing the stability of the surrounding rock in the tunnel and determining the sequenced construction method of initial support, the problem of mutual restriction of equipment flow in mechanized supporting tunnel construction is solved, and construction efficiency and safety are improved.

CN114837671BActive Publication Date: 2025-02-28CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP CO LTD
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Patent Information

Application Number
CN202210321296.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-03-30
Publication Date
2025-02-28
Estimated Expiration
2042-03-30

AI Technical Summary

Technical Problem

During the mechanized supporting tunnel construction process, due to the limitation of the tunnel operation surface space, excavation, slag output, and initial support equipment flow are restricted, which limits the improvement of construction efficiency.

Method used

By obtaining the basic information parameters of the tunnel, analyzing the stability of the surrounding rock in the tunnel, and determining the sequenced construction method of initial support based on the surrounding rock stability and the safety coefficient of the anchor rock bearing arch, reducing the support volume of initial support and shortening the excavation-support single cycle time.

Benefits of technology

On the premise of ensuring safety, the initial support volume of the palm surface is reduced, the excavation-support single cycle time is shortened, the construction efficiency is improved, and the problem of limited construction efficiency improvement caused by the space limitations of the tunnel operation surface is solved.

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Abstract

The present invention relates to the field of tunnel engineering technology, and specifically to a mechanized supporting tunnel initial support sequence construction method, comprising the following steps: S1, analyzing the stability of the tunnel surrounding rock by acquiring the basic information parameters of the tunnel; S2, determining the initial support sequence level according to the surrounding rock stability and the anchor rock bearing arch safety factor; S3, the full sequence construction scheme is to use initial sprayed concrete and local anchor support after tunnel excavation, and the second sequence reinforcement initial support lags behind a certain distance; the semi-sequence construction scheme is to use initial sprayed concrete and system anchor support after tunnel excavation, and the second sequence reinforcement initial support lags behind a certain distance; the distance between the first sequence initial support and the second sequence reinforcement initial support needs to meet the mechanized operation space of tunnel advance support, excavation, slag discharge and first sequence initial support. The present invention implements the initial support in sequence, reduces the support amount of the initial support of the face under the premise of ensuring safety, shortens the single cycle time of face excavation-support, and improves construction efficiency.
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Citation Information

Patent Citations

  • Method for designing tunnel composite lining based on total safety factor process

    CN109667598A